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Intake manifold here of black plasticky stuff is drilled for the plenum. Bolts onto the lower valve block pieces with a couple of spacers. An O.S. carb will feed the engine.

From RAINBIRD Irrigation Systems, I find some 90 deg elbows that fit in nice to the valve blocks the inch and three-eights distance between them. They are the right kind of rigid plastic for use here. Just cut off the barb and press fit into the port up to their flange. Aim them to the front...

Atmospheric intake valves seem to be winning in my designs. Even more so integrating into SQUARE FOUR being to the inboard of the cylinder heads. Space being at a premium here for another cam drive. Pair of aluminum flat stock pieces (previous model shown) sandwich the valve guides sealed by...

Roller bearing cranks are an easy spin! Where is your engine these days?

I like that idea too Vietti! Converting a spade clip electrode to a threaded one with an eyelet and nut.

Thanks Steamchick. I am not having negative issues with hardware store AWG 14-16 for high tension leads to the sparkplugs. Holds up well with the high volts and low amps. Either AA batteries or my 2Amp power supply run the ignition.

You are right Stan, could be an issue. I did have a couple dancing around on the sparkplug while running. A solution was to give the electrode at the insulator a drop of Super Glue or epoxy to dry ......then seat the terminal upon.. That film was enough to give the base a wedge upon the...

Sometimes the price of parts one uses building models hits me the wrong way. Gives you a chance to find substitutes for these particular items.......... ............or an opportunity to make your own! The top of the electrode diameter on a CM-6 sparkplug. I take a 3/8in brass round for the...

Using collet locker to join flywheel to their shafts pretty exclusively over the years. A three bolt retainer squares up the flywheel to its shaft for a true run. I use Delrin collets slit on one side spaced out with a brass or aluminum tube over shaft to a length that extends the collet past...

Tail end of this shaft drives the distributer. Using a 3/4in. inner dia. PVC end cap with #8 brass screws for the wire leads. Extended length brass bushing pressed into aluminum body for the dist. shaft to rotate in. Easy placement upon a pair of 1/4in. rounds on the shaft end plate, the body...

The cam drive......belt or geared? Drive cogs are seven inches apart. Gonna need a belt longer than my shoe laces and three idlers in this scale. Going to do gear drive in seven gears from the cam sprocket for a more compact arrangement. Transfer shafts off the sprocket shaft through...

The cyl. head overhangs the outboard side of the block. On the low side of block a shallow cut mill run up its length for the lifter bar. Installed, the pushrod will pass through the head to the exhaust valve only rocker arm on top. Completed Lifter bar with camshaft attached

Tecumseh points and condenser. Oregon branded on Ebay seems to have best prices. .....Dave

On the nose end plate backside go the ign. points. A slot milled into the end of the vertical plate for the insulated connection to coil. Lead for the condenser and a quick connect spade goes under the screw nut for the 6 volts.

The lower end of SQUARE FOUR. Looks like the start of a donkey or ore cart. Bearing end plates set the spacing between the vertical plates. Trying out a set of 1Mod 20T helical cut bevel gears over straight cut bevels used on the SIDE SHAFTER engine. Checking the three gear fit before bearing...

Round stock for the cylinder heads on these rectangular bocks. Combustion chambers are bored to 3/8 in. depth. With the pistons rising to 1/4 in. below the block deck that gives easy turnover compression to hand start with 3 -4 in. diameter flywheels. The larger diameter cut in the bottom of...

The webs are finished with a 5/16 in. stub shaft. A brass tube spacer on the web side of bearing spaces out to clear the screw heads. On the bearing flange side an aluminum spacer, tapered to ride the inner bearing race. The machine screws will be replaced for the spacer and the bearing carriers...

The S/F will be using the geared crank webs. This is my third engine build with this method having opened up some unique design elements transferring the reciprocal to rotary motion. The webs need steel halves to balance out the piston/ rod assembly. The webs are made by the pair. The...

This S/F is a pair of inline twins with a common output shaft right down their center. One inch bore with liners and O-ring head gaskets. A relief is milled in at the lower inside corners of the blocks to receive quarter inch aluminum plate verticals to accommodate the crank shaft throws.

A rare configuration in I/C engines is the square four. From the motorcycling world in the form from the British Ariel S/F classic for three decades....... .....to Suzuki in their GP500 racing campaign years in the '70s thru 1990. Can I do this configuration as my usual industrial utility...